Software and Summary
Katar Pro XT's minimalistic design is such that it's well-suited as a plug-and-play solution, though as always you can install Corsair's iCue software utility for further fine tuning and firmware updates. At the time of writing v1.2.20 is the latest for the mouse, while the MM700 mouse pad currently runs v1.0.5. Applying the latest versions takes a couple of minutes tops.
iCue's interface presents all of the available tweaks in a familiar manner. Every available button can be remapped to a wide range of actions including user-recorded macros, the backlit scroll wheel can be customised or synchronised with other compatible hardware, and the three DPI shortcuts (four if you use a sniper toggle) allow for modifications on the x and y axis, as well as colour coding for easy identification.
MM700 also makes an appearance in iCue for customised lighting effects, some of which work better than others. Static colours result in visible hot spots, while waves or gradients tend to offer a more consistent look. Beyond lighting, it's a shame Corsair doesn't allow the hub's solitary button to be remapped; once your lighting effects are in tune, it'd be handy to be able to use that button for something else.